TY - JOUR
T1 - Continuous Class-J/F-1Mode Asymmetrical Doherty Power Amplifier With Extended Bandwidth and Enhanced Efficiency
AU - Sun, Jia Xing
AU - Lin, Feng
AU - Li, Bo
AU - Sun, Houjun
AU - Chen, Wenhua
N1 - Publisher Copyright:
© 1963-2012 IEEE.
PY - 2023/11/1
Y1 - 2023/11/1
N2 - This article presents a design method of continuous class-J/F-1 mode asymmetrical Doherty power amplifier (DPA) using the phase tuning technique. By properly adjusting the phase characteristics of the output matching network (OMN) of the carrier amplifier (CA) and the harmonic impedances of the postmatching network (PMN), the load impedance of CA can be effectively tuned to meet the impedance requirements of continuous class-J and continuous class-F-1 modes at the power back-off point, which thus extends the bandwidth with enhanced power back-off efficiency. In addition, the proposed DPA can theoretically achieve saturation efficiency of more than 58.7% over the working frequency. Based on the proposed method, a broadband continuous class-J/F-1 mode asymmetrical DPA operating from 1.3 to 2.5 GHz (63%) is designed and measured. Under the continuous wave stimulation, the measured 9-dB back-off, 6-dB back-off, and saturation efficiencies are 55%-62.5%, 52.4%-65.6%, and 62.5%-81%, respectively. The measured 9-dB back-off and saturation gains are 8.8-11.3 and 7-10.6 dB, respectively. When driven by a 20-MHz long-term evolution (LTE) modulated signal with 9.9-dB peak-to-average power ratio (PAPR), the measured average efficiency is 47%-59% and the adjacent channel power ratio is from-23.6 to-31.7 dBc.
AB - This article presents a design method of continuous class-J/F-1 mode asymmetrical Doherty power amplifier (DPA) using the phase tuning technique. By properly adjusting the phase characteristics of the output matching network (OMN) of the carrier amplifier (CA) and the harmonic impedances of the postmatching network (PMN), the load impedance of CA can be effectively tuned to meet the impedance requirements of continuous class-J and continuous class-F-1 modes at the power back-off point, which thus extends the bandwidth with enhanced power back-off efficiency. In addition, the proposed DPA can theoretically achieve saturation efficiency of more than 58.7% over the working frequency. Based on the proposed method, a broadband continuous class-J/F-1 mode asymmetrical DPA operating from 1.3 to 2.5 GHz (63%) is designed and measured. Under the continuous wave stimulation, the measured 9-dB back-off, 6-dB back-off, and saturation efficiencies are 55%-62.5%, 52.4%-65.6%, and 62.5%-81%, respectively. The measured 9-dB back-off and saturation gains are 8.8-11.3 and 7-10.6 dB, respectively. When driven by a 20-MHz long-term evolution (LTE) modulated signal with 9.9-dB peak-to-average power ratio (PAPR), the measured average efficiency is 47%-59% and the adjacent channel power ratio is from-23.6 to-31.7 dBc.
KW - Broadband
KW - Doherty power amplifier (DPA)
KW - continuous mode
KW - gallium nitride (GaN)
KW - high efficiency
UR - http://www.scopus.com/inward/record.url?scp=85161051522&partnerID=8YFLogxK
U2 - 10.1109/TMTT.2023.3275177
DO - 10.1109/TMTT.2023.3275177
M3 - Article
AN - SCOPUS:85161051522
SN - 0018-9480
VL - 71
SP - 4814
EP - 4825
JO - IEEE Transactions on Microwave Theory and Techniques
JF - IEEE Transactions on Microwave Theory and Techniques
IS - 11
ER -